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(No Model) W. JANBUS. ELBGTRIG ARG LAMP.

Patented Jan. 23, 1894.

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W. JANDUS. ELECTRIC ARG LAMP.

No. 513,111. Patented Jan. 23,1894.

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W. JANDUS. ELECTRIC ARG LAMP.

No. 513,111. Patented Jan. 28,1894.

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irai) STATES v PATENT Ormes.

WILLIAM .IANDUS, OF CLEVELAND, OHIO, ASSIGNOR OF ONE-HALF TO JOIIN B.BARTON, OF SAME PLACE.

ELECTRIC- SPECIFICATION forming part of Letters Patent No. 513,1 11,dated January 23, 1894.

Application tiled October 22,1892. Serial No. 449,614. (No motleld To@ZZ wil/011e it may concern.:

Be it known that I, lVILLIAM JANDUS, a citizen ot the United States, anda resident of Cleveland, county of Cuyahoga, and State of Ohio, haveinvented certain new and useful Improvements in Electric-Arc Lamps, ofwhich the following is a specitication, the principle of the inventionbeing herein explained and the best mode in which I have contemplatedapplying that principle, so as to distinguish it from other inventions.

The annexed drawings and the following description set forth in detail,one mechanical form embodying the invention; such detail constructionbeing but one of various mechanical forms in which the principal of theinvention may be used.

In said annexed drawings-Figure I represents a vertical section of myimproved electric are lamp; Fig. II, an enlarged sectional detail viewof the upper end of the tubes which support the lamp; Fig. III, asection of the auxiliary carbon holding tube; Fig. III, a cross sectionof the same on theline A-B, Fig. III; Fig. IV, a section of the magnetsand the movable armature; Fig. IVa, a cross section on the line O-D,Fig.IV; Fig. IV", a cross section on the line E-F, Fig. IV; Fig. V, avertical sectional detail View of the carbon feeding mechanism, Fig. V,across section on the line I-J, Fig. V; Fig. VI, a verti cal section ofthe carbon feeding mechanism, the surrounding casing for the same, andthe upper portion of the globe; Fig. VI, a cross section on the lineG-IL Fig. VI Fig. VII, a section of the support for the negative carbonFigs. VIII and XII, sectional detail views ot the clutch mechanism,respectively showing the positive carbon clutched and raised to form thearc, and in its position of release; Figs. IX, X and XI, respectively asection, a top, and a bot-tom view of the collar for the lower brushes;Figs. XIII and XIV sectional detail views ot the negative carbon holderand the lower end of the carbon supporting frame; Figs. XV and XVI,sections of two other forms of magnets; Fig. XVII, a sectional detailview of another form of cutoff sleeve for the shortcircuiting device,and Figs. XVIII and XIX, sectional detail views ot the movable armatureand the clutch rings, the sections being made at right angles to eachother.

The lamp illustrated in the drawings is a hanging lamp or lamp destinedto be supported from above. An insulating plug, L', has a threadedsocket, L5, secured upon its upper end, by means of which socket thelamp may be secured pending from the ceiling of a room or from otherelevated support. A supporting tube L is screwed with its upper end tothe lower end of the insulating plug, and clamps an insulating disk, L2,between its upper end and a shoulder upon the plug. The ends et' theconductors of a supply circuit are secured to a negative binding screw,L?, and a positive binding screw, L; and the ends of the negativeterminal conductor, tu', and positive terminal conductor, w, are securedin contactwith said line conductors by means of said binding screws. Thelower end of the supporting tube L is screwed upon the upper end of acarbon-containing tube t, upon the upper portion of which adisk, a,having a central aperturac?, is secured by said central aperture. Thedisk a is of soft iron and forms a portion of the upper magnet, havinglimbs, ct', projecting downward. A similar disk, b, of the lower magnet,is secured to the carbon-containing tube t, by means of a flange, t',fitting into a rabbet, b3, in the central opening, b2, of the lowermagnet disk; or said disk may be brazed or otherwise secured to thetube. The lower magnet disk has upwardly projecting limbs, if', and saidlimbs have axial bores, corresponding to similar bores in the limbs ofthe upper magnet. The bores of the lower magnet extend entirely throughthe limbs, while the bores in the limbs of the upper magnet extend onlypartly through said limbs. Tubes, d, of brass are secured in the boresof the magnetlimbs and in airtight engagement therewith; their lowerends resting upon shoulders formed in the lower ends of the lower bores,so as to make continuous and smooth bores through the limbs. The ends ofthe limbs of the two magnets are at a predetermined distance from eachomen-such distance being determined by the length of the interior brasstubes,-so as to produce acon- IOD ' a I 513,111A

densed magnetic tield between the ends of the magnet limbs; the saidfield being tigzed and adjusted according to the length of pull requiredor the length of travel ot'` the armature cores.

The series and shunt coils are wound in the usual manner, but in suchdirections that all of the several poles of the magnets will be inmagnetic series. Said term, via-magnetic series, is employed for themagnets as analogous to the term series when employed to describe thearrangement of electric generating or translating devices, Viz.-withtheir poles opposed to other poles of opposite polarities ordenominations; so that the north pole of one magnetis opposed to thesouth pole of the other magnet and the south pole of said tirst-namedmagnet is opposed tov the north pole of the second magnet. The magnetsare consequently in magnetic series, and

,..-v'the magnetic circuit in the magnets will be completed when thearmature is so attracted that it closes the magnetic gaps between thepoles of the magnets.

I prefer to wind the series coil, M, upon the lower magnet, and theshunt coil, M', upon the upper magnet, as illustrated in Fig. II, butmay employ compound winding, as illustrated at M3, in Figs. V and VI, inwhich the compound coil is shown as wound upon spools, M2. In eithercase, the upper magnet serves, so to speak, as a stationary armature tothe lower magnet, and vice versa; -the magnetic circuit being completedthrough the gaps between the poles, where the field is powerfullycondensed. The same condensation of the field may be obtained by simplyforming the stationary armature in the shape of a bar or disk supportedat the desired distance from the ends of the magnet limbs by the brasslining tubes, as illustrated in Figs. XV and XVI. In the formillustrated in Fig. XV, the limbs of the movable armature are long, andextend through the entire length of the limbs ot' the magnet; and in theform illustrated in Fig. XVI, the limbs ot' the movable armature areshort and extend through the stationary armature into the ends of themagnet limbs. In either case the magnetic circuit finds a path, from onepole to the other, through the stationary armature and the field iscondensed at the points between the poles of the magnet and the oppositepoles of the stationary armature. This condensation of the ield is ot'great importance as it enables me to operate the movable armature andthe carbon clutch with a comparatively small number of ampere turns ofwire in the coils, obviating the use of levers and other powermultiplying devices for producing a strong dierential effect. Themagnetic field is highly condensed within the gapsbetween the opposedpoles of opposite denominations of the two magnets, and the cores of thearmature do not close the magnetic circuit until completely drawn upinto the gap so as to be within the bores of the upper magnet.

The strong pull caused by this arrangement of magnets in magnetic seriesand with gaps between all of the opposed poles of oppositedenominations, is entirely dependent upon said gaps within which themagnetic force is condensed. The gaps are absolutely essential 'to theoperation of this style of magnet; as it destroys or is detrimental tothe ethciency of the magnet to close the magnetic circuit before Athearmature arrives at the end of its attracted position, when it simplyacts as a keeper, uniting the two magnets into one. A circular armaturedisk, c, has two upward- 1y-projecting cores, c', and has a centralaperture for the carbon containing tube, from which aperture slots, c2and c3, radiate; said slots having their outer ends beveled to faceupward, and the slots c2 having the bevels at a greater angle to thesides of the central eperture than the slots c3. Small metallic bodies,e, ot' spherical shape, such as shot, are placed in the brass tubes, atthe ends ot' the armature cores, so as to always insure metalliccontact. The lower end of the positive terminal conductor w is secured,by means of c a nuty, to a screwthreaded binding post, y, which latteris secured in the upper magnet disk a and insulated from the same bymeans of a non-conducting sleeve, wg; and the cur-l rent passes throughsaid binding post to the terminal, m', of the series coil, M, whichterminal is secured to the binding post by a suitable nut. The seriescoil is wound upon both magnet limbs, and its other terminal, m2, is incontact with the upper disk, a, conveying the current through said diskto the carboncontaining tube t. Said terminal m2 is held to the disk bya ange upon the lower end of an insulating sleeve, 'm4, and by asuitable nut upon a screwthreaded rod, j, which forms a part ot thenegative conductor within the lamp, the terminal being thus insulatedfrom said rod, which is also insulated from the disk by passing throughthe insulating sleeve. The negative terminal conductor w is attached tosaid negative conductor rod by means of a binding nut w3. The terminals,m3 and m4, of the shunt coil, M', are clamped and connected to thepositive and negative terminals, across the arc. A shortcirouitingdevice, x, is connected across the terminals of the series coil, and isformed by a wire, 0c', doubled into the form of a loop having parallellimbs, and wound in parallel strands around an insulating post, x2,secured at its upper end upon the lower end of the positive binding posty. The doubled, lower end ot' the looped wire is secured to the post bymeans of a screw, screwed into a countersink, x7, in the post. Thelength of the shortcircuiting device and, consequently, the degree ofthe resistance in the same may be Varied by means of aninternallyscrewthreaded metallic sleeve, ac3, having parallel threadscut in it to engage the parallel limbs of the wire,so as to be moved upor down upon the coil and thus shortcircuit it at any desired point.

IOO

IIO

One terminal of the shortcircuiting device is secured to the post by ascrew, il, which is in contact with the positive binding post yror oneterminal of the series coil,-and the other terminal ot' theshortcircuiting device is secured against and in contact with the upperdisk c,or the other terminal of the series coil,-by means of the lowerbinding screw upon the positive binding post y; being insulated from thelatter by the insulating sleeve tu?.

Instead of employing the screwthreaded sleeve 503, a plain sleeve may beused, as illustrated in Fig. XVII, said sleeve having a set screw, m8,by means of which the sleeve may be brought into metallic contact withvdifferent portions ot' the wire eiiecting a shortcircuit at any desiredpoint. The degree ot' the resistance of the shortcircuiting device maythus be adjusted by sliding the sleeve, up or down, according to whetherthe resistance is to be decreased or increased, and this adjustableshortcircuiting coil will be perfectly certain in its operation and willoccupy but a small space in the lamp. The lower end of the negativeconductor rod j is coupled,-by means of a coupling sleeve, 7e3-t0 arod,j, which passes through a metallic sleeve, Z, inserted through thelower magnet disk l), but insulated from the same by means of a suitableinsulating sleeve. The lower end of said rod is secured in a disk, 0,which forms a part of the negative conductor within the lamp. A nut, mtits upon the rod j', and said nut and rod form one of the supports forthe disk 0. A corresponding rod,j2, has its lower end secured in thedisk 0; passes up through a metallic sleeve, Z,inserted through thelower magnet disk and insulated from the same,-and enters the lower endof the insulating post for the shortcircuiting device. A nut, m5, uponthis rod, above the lower magnet disk, serves to support the disk o,similar to the nut on. This rod j? and its sleeve Z form,- together withdisk 0 and the rod j', sleeve l, and `rodj`,a part oi the negativeterminal conductor Within the lamp. The disk 0 has a downwardlyprojecting, serewthreaded neck, o2, within which an insulating sleeve orpacking, o', is secured; said sleeve insulating the negative disk fromthe positive carboncontaining tube t. An oblong carbon-supporting frame,r, is secured with a screwthreaded opening, 01', in its upper end to thescrewthreaded neck o2, and said frame has a screwthreaded opening, r2,in its lower end, formed with an upwardly contracted, smooth portion,r3, which terminates in a smooth and straight opening, r4, of a diametersuiiicient to admit a carbon pencil ot the greatest diameter capable ofuse in the lamp. A lower, negative carbon holder, s, has a screwthreadedsleeve, s2, which may t into the lower screwthreaded opening of thecarbon-supporting frame, and has a tube, s', secured inside said sleeve;said tube having its upper end slightly beveled and having longitudinalslits in its upper portion, which admits of the tube being contracted atits upper end to clamp the carbon, when the carbon holder is screwed upinto the lower opening ot the earbon-supporting frame. An insulatinghandle, s3, is secured in the Vlower end of the carbon-holder by meansof a rivet or pin, s, inserted through the outer screwthreaded sleeve,the slitted tube, and the end of the. handle. A cup-shaped pan, s4, isiitted around the handle, to slide upon the same, beneath the lower endsof the tube and sleeve, and is insulated from said tube and sleeve by aninsulating washer, S5. A spring, 58, is coiled around the handle, andbears against a shoulder upon the saine with its lower end, and saidspring is inclosed by a sliding sleeve, 5", having an inward flange, S9,at its upper end, which rests upon the upper end of the spring, andbears against the pan. The carbon-containing tube 't has longitudinalslots, 155, and two rings, t and t2, are suitably secured, one above theother, around the slotted portion of the tube. Rings, 153,-havinggrooved peripheries to engage the carbon, and forming radial clutchesfor the same,- are hung upon supporting ring t6, and have play in theupper portions of the slots, and in the radial slots c2 and c3 of thearmature. Similar rings, t1, forming the upper radial brushes, arehung,to have play in the lower portions of the slots,-upon the lowersupporting ringz?. The disk o has an 11p-turned edge or flange, o5,aroundits central opening, and the upper radial brush rings t* may havecontact with said flange when the carbon is removed. A nut, u, is fittedupon the lower screwthreaded portion of the carbon-containing tube t,and serves to rigidly clamp a casing, e', between the disk 0 and lowermagnet disk b securely binding together the lamp structure on thecentral tube t. A collar, o, is secured upon the lower end of thecarboncontaining tube, and is formed in its lower end with slots, inwhich lower-brush rings, o2, have play, said rings being supported by aring, e', secured to the collar. A casing, t',

' is clam ed between the lower magnet disk I) and the negative disk o,said disks being drawn together by the nut u, and asbestus rings orsimilar insulating rings,p, are interposed between the under side ot'the lower magnet disk and the upper edge of said casing, and between theupper side of the negative terminal disk o and the lower edge of thecasing so as to form an airtight, insulating and non-combustible packingfor the chamber formed by the parts and inclosing the armature andclutch device. Insulatin g sleeves, n, are secured upon the rods j', andj?, serv- ICO ing as stops upon which the armature may rest whenlowered. The edge of the upper opening in the globe, e', is clampedbetween the negative disk o and the carbon frame r; insulating asbestuswashers, p2 and p3, being interposed, as well as a metallic washer, q,be-

tween the carbon frameand the lower washer p3, which serves to stiftenand support said washer. The upper portion of the globe is thus closedair-tight. The edge of the pan bears against the lower opening in theglobe. A collar, h, surrounds 'the lower end ot' the airtight chamberz', and rests upon thetop ot' the globe. A collar, f3, having openingsformed inv it, is secured upon the upper por tion of the airtight casingt', and has a liange,

g, into which the lower end of a cylindrical casing,f, tits. The upperportion of said cylindrical casing is formed with air holes, f. Theupper end of the cylindrical casing f is contracted, and the lower endof a tube, f2, is secured to said contracted end. This tube f2 surroundsthe tube L; and a canopy, L6, is secured to the upper end of said outertube f2, and surrounds the socket at the end of the inner tube L and thebinding screws.

A positive carbon-holding tube, N2, may be used to lengthen the life ofthe positive carbon, and said tube has a slightly contracted, longsocket portion, N5, at its lower end into which the carbon may beinserted; said socket portion having longitudinal slits, N4, whichrender the socket elastic. The upper end of the elastic socket is formedwith an inwardly projecting bead, N3, which serves as a stop for the endof the carbon.

The positive carbon is lettered N, and the negative carbon is letteredN', in the drawings.

It' desired, the binding post connections at the upper end of thesupporting tube L and its surrounding tube, may be dispensed with, andthe terminal conductors may extend at the upper ends of the tubes L andf2, through the insulating plug, where they may be suitably connected tothe circuit wires. y

The carbons are inserted into the lamp by uuscrewing the lowercarbon-holder from the threaded opening in the carbon-supporting frame.The removal of the carbon holder and pan admits ot' the inside of theglobe, as well as the carbon-supporting frame and other parts within theglobe being cleaned; the lower opening ot' the globe affording ampleroom for the insertion of the hand and a cloth or other cleaning means.The positive carbon may now be inserted through the opening in the lowerend of the carbon-supporting frame, the upper, contracted portion ofsaid opening admitting a carbon of the greatest diameter capable of usein the lamp, but preventing the insertion of a carbon of agreaterdiameter than what will enter the radial brushes and clutches. The endof the carbon, as it passes up through the lower brushes, will push saidbrushes outward and will push them out of contact with the 11p-turnedrim of the'negative terminal disk o, whereupon the carbon pushes theclutch rings out, and is in position to be held by the same when thecurrentis turned on and the armatureis drawn up. The negative carbon isplaced inthe slitted tubeof the carbon-holder, and will be clamped whenthe latter is screwed -in place. As thel rings, the upper brush-rings,and the lower brush rings,-and will always be well centered,irrespective ot' any minor irregularities in the shape of the carbon.The brushes and clutches will, on account of their form,-beV ing shapedas rings,-have a yielding contact with the carbon, such contact beingpartly rolling and partly sliding. When the carbons are secured and thecurrent is turned on, the current will pass through the positiveconductor and the positive binding post, through the series coil, and tothe upper magnet plate a from which it will pass into the carboncontaining tube to the positive carbon, passing through the brushes andclutch. From the positive carbon it passes through the negative carbon,through the carbonholder and carbon-supporting frame to the negativeterminal disk o, through said disk to the negative terminal rods j andj, and to the negative conductor.' The circuit being completed,'theseries coil energizes the magnets which attract the movable armature.The latter draws the clutch rings upward, and forces them against thecarbon, as the beveled ends of the slots in the armature strike upward;the arc is formed, and the lamp is in operation. The clutch rings in theradial slots c2 will iirst engage thecarbon with a slight clutch, whenthe armature is drawn upward, on account of the longer and less steepincline ofthe bevels of said slots; and the clutch rings in the slots c3will next engage the carbon with a stronger clutch, on account of thesteeper incline of the bevels ot` said slots, so that the armature willgradually raise the carbon and form the arc. When the armature islowered, a similar gradual release of the carbon may take place,corresponding to the gradual clutch of the carbon by the attractedarmature; the clutches which are engaged by the steep inclines releasingthe carbon, whereupon the clutches engaged by the less steep inclineswill allow the carbon to drop, exerting, however,a braking influenceupon the carbon, as they revolve upon the inclines. When the positivecarbon has been consumed so that its upperv end falls below the clutchesand cannot be held by the same, the current will iirst pass freelythrough the carbons, energizing the magnets so that they draw themovable armature upward in contact with the cut-out sleeves Zand t;forming the circuit through the armature,

the cnt-out sleeves and the negative terminal rods, and short-circuitingit from the electrodes. This cut-out will consequently be through theseries coil and by the series coil.

It' the current should be turned on while no positive carbon is in thelamp, the primary contact will be throughl the lower brushes,

down in contact with the upwhich hang IOC IIO

of an arc-inclosing chamber closed air-tight at its top and sides, acarbon-supporting frame secured in said chamber, a carbon-holder securedin the lower end of the carbon-supporting frame, and a pan yieldinglysupported upon said holder and closing the bottom of the arc-inclosin gchamber, substantially as set ,foi-th.

8. In an electric arc lamp, the combination of an arc-inclosing chamberclosed air-tight at its top and sides, a carbon-containing tube openinginto the top of said chamber, a carbon-supporting frame secured in thearc-inclosiiig chamber, a carbon-holder secured in said carbon-supporting frame, and a pan yieldingly supported upon said holder andclosing the bottom of the arc-inclosing chamber, substantially as setforth.

9. In an electric arc lamp, the combination of an arc-inclosing chamberclosed air-tight at its top and sides, a carbon-containing tube openinginto the top of said chamber, a carbon-supporting frame supported at itsupper end in the top of the arc-inclosing chamber, a carbon-holdersecured in the lower end of said carbon-supporting frame, and a panyieldingly supported upon said holder and closing the. bottom of thearc-inclosing chamber, substantially as set forth. y

10. In an electric arc lamp, the combination of an arc-inclosing chamberclosed air-tight at its top and sides, a carbon-containing tube eX-tending into the top of said chamber, a carbon-supporting frame securedat its upper end in the top of the arc-inclosing chamber, acarbon-holder secured in the lower end of the carbon-siipporting frame,and a pan yieldingly-supported upon said holder and closing the bottomof the arc-inclosing chamber, substantially as set forth.

11. In an electric arc lamp, the combination of an arc-inclosingvchamber closed at its top and having an opening at its bottom, an uppercarbon-container entering through the closed top of the chamber, and aframe in the chamber having an opening at the bottom-opening of thechamber, registering with the carbon-container, and of a diameter equalto the diameter of the greatest capacity of said container,-tlie openingin said frame being so located as to form the only passage for theinsertion of carbons into the upper container, substantially as setforth.

l2. In an electric arc lamp, the combination of an arc-inclosing chamberclosed at its top and having an opening in its bottom, an uppercarboncontainer entering through the closed top of the chamber, acarbon-supporting frame within the chamber and having an opening at thebottom opening of the chamber, registering with the uppercarbon-container and of a diameter equal to the diameter of the greatestcapacity of said upper container, and a lower carbon-holder secured insaid opening,-said opening in the carbonsupporting frame being solocated as to form the only passage for the insertion of carbons adiameter equal to the greatest diameter of the carbon capable of beingheld in said tube,

and a carbon-holder secured in said openingl in the frame,-said openingin the carbonsiipporting frame being so located as to form the onlypassage for the insertion of carbons into the upper container,substantially as set forth.

14. In an electric arc lamp, the combination of a carbon-supportingframe forming one series terminal, a metallic lower carbonholderremovably secured in said frame and in contact with the same, and aninsulating handle in the lower end of said carbon-holder, substantiallyas set forth.

15. In an electric arc lamp, the combination of an arc-inclosing chamberformed with a hand hole at its bottoni, a lower carbon-holder formingone series terminal, and a closure for the hand hole yieldinglysupported by and insulated from the carbon-holder, substantially as setforth.

16. In an electric arc lamp, the combination of an arc-inclosingchamber, a lower carbonholderforming a series terminal,an insulatedhandle secured in the lower end of said carbon-holder, a pan yieldinglysupported upon said handle and covering the bottom opening of thearc-inclosing chamber, and a washer upon the handle and at the lowereiid of the carbon-holder,-said washer serving as an upper stop for saidpan, substantially as set forth.

17. In an electric arc lamp, the combination of an arc-inclosingchamber, a carbon-supporting frame secured in said chamber and formedwith an opening in its lower end having a screwthreaded portion "and anupper tapering portion, a carbon-holder having a screwthreaded portionand a slittedportion and fitting in said opening, and a panyieldingly-supported upon said carbon-holder, and covering the openbottom of the arc-inclosing chamber, substantially as set forth.

18. In an electric arc lamp, the combination of an arc-inclosing chamberhaving an opening at its bottom, a carbon-holder at the bottom of saidchamber provided with a handle, a spring upon said handle, and a panfitted to slide upon the handle and cushioned by said spring, said panfitting to close the opening in the arc-inclosing chamber, substantiallyas set forth.

19. In an electric arc lamp, the combination of an arc-inclosing chamberhaving an opening at its bottom, a carbon-supporting frame supportedwithin said chamber and having an opening at its lower end formed with ascrewthreaded portion and an upwardly ta pering upper portion, acaibon-liolder consisting of a screwthreaded sleeve fitting in thethreaded portion of said opening and a slitted tube having its slittedend entering the tapering portion of the opening, and provided with aninsulated handle, a spring upon said handle and confined upon the saineat its lower end, a sleeve over said spring and formed with a ilangebearing against the upper end of the same, and a pan fitted to slideupon the handle to bear against the flange and closing the opening inthe bottom of the arc-inclosing chamber, substantially as set forth.

20. In an electric are lamp, the combination of anelectrode-containingtube, sets of radial brushes supported, one abovethe other upon said tube, a set of radial clutches supported upon thetube, and the armature of the electro-magnet in the lamp constructed toactuate said clutches, substantially as set forth.

2l. In an electric arc lamp, the combination of clutches suspended tohave longitudinal and radial movement in relation to the electrode, andbrushes suspended at a distance below said clutches to swing radiallyand to engage the electrode by their gravity,-said brushes therebyfeeding the current to the electrode and completely centering andguiding the same, substantially as set forth.

22. In an electric arc lamp, the combination of an electrode-containingtube, clutches radially suspended in said tube to engage the electrodefrom radiating directions, and current feeding and centering brushessuspended in the lower end of the tube gravitating toward the axis ofthe same,-said brushes thereby feeding the current to the electrode andcentering the same at its lowermost point of support, substantially asset forth.

3. In an electric arc lamp, the combination of two sets of radialbrushes, arranged one above the other to support the electrode, a set ofradial clutches arranged above said brushes, and the armature of theelectroniagnet in the lamp, constructed to actuate said clutches,substantially as set forth.

24. In an electric arc lamp, the combination of an electrode-containingtube, an electro magnet having a movable armature, and a plurality ofsets of rings pivoted to projectinto the interior of the tube, one ofsaid sets capable of being engaged by the armature and to be forcedtoward and from the axis of the tubo by the movement of the armature,substantially as set forth.

25. In an electric arc lamp, radially arranged brushes suspended atpoints above their cent-ers of gravity to swing inward and engage theelectrode by their gravity, substantially as set forth.

26. In an electric arc lamp, radially ar ranged brushes suspended tohave longitudinal and radial play relatively to the electrode,

and to engage the same by their gravity substantially as set forth.

27. In an electric are lam p the combination of an electrode-containingtube, and brushes suspended to have longitudinal and radial play throughthe sides of said tube and to engage the electrode within the latter bytheir gravity, substantially as set forth.

2S. In an electric arc lamp, the combination of clutches radiallysuspended around the electrode, and a separate movable armature of theelectro-magnet in the lamp,-said armature constructed to engage andactiiate the clutches when attracted, substantially as set forth.

29. In au electric arc lamp, the combination of an electrode-containingtube formed with longitudinal slots, and rings pivotally stipported insaid slots, to engage the electrode, substantially as set forth.

30. In an electric aic lamp, the combination of clutches suspendedradially in their relation to the electrode, and a separate movablearmature of the electro-magnet in the lamp,- said armature havingsurfaces which engage and actuate the clutches when the armature isattracted, substantially as set forth.

3l. In an electric arc lamp, the combination of radially arrangedclutches suspended .to have longitudinal and radial movement in theirrelation to the electrode, and a separate movable armature of theelectro-niagnet in the lamp,-said armature having surfaces adapted toengage and force inwardly said clutches, substantially as set forth.

In an electric arc lamp, the combination of radially arranged andpivotally supported clutch rings, an electro-magnet, and a movablearmature for the same formed with beveled surfaces engaging said ringswhen the armature is raised, substantially as set forth.

33. In an electric arclamp, the combination of clutches suspended tohave longitudinal and radial play in their relation to the electrode,and a separate movable armature of the electro-magnet in the lamp,-saidarmature having beveled surfaces engaging said clutches,substantially asset forth.

Si. In an electric arc lamp, the combination of an electrode-containingtube, clutches suspended to have longitudinal and radial play throughthe sides of said tube, and a separate movable armature of theelectro-magnet in the lamp,-said armature having beveled surfacesengaging said clutches, substantially as set forth.

35. In an electric are lamp, the combination of radially arrangedclutches, and a movable armature of the electro-magnet in the lamp,constructed to successively engage pairs of opposite clutches whenattracted by the magnet, substantially as set forth. t

3G. In an electric arc lamp, the combination of radially arrangedclutches having longitudinal and radial play relatively to theelectrode, and a movable arniatui'e having opposite surfaces ofdifferent incline from IOO IIO

pairs of opposite clutches, and an armature ofthe electro-magnet in thelamp formed with pairs ofopposite inclined surfaces having differentinclines to successively actuate the pairs of opposite clutches,substantially as set forth. l Y

38. In an electric arc lamp, the combination of clutch rings arranged inpairs of opposite rings to have radial and longitudinal play relative tothe electrode, and a movable armature of the electro-magnet in the lamp,constructed with beveled surfaces arranged in opposite pairs to engagesaid rings, each pair of opposite surfaces having a different incline soas to successively actuate the pairs of clutch rings, substantially asset forth.

39. In an electric are lamp, the combination of a longitudinally slottedelectrode-containing tube, rings pivotally'supported to project throughthe slots of the tube and into the same, and a movable armature of theelectroniagnet in the lamp, said armature having upwardly beveledsurfaces engaging said rings, substantially as set forth.

40. In an electric arclamp, the combination of the series terminals, andcurrent feeding brushes suspended from one of said terminals to engagethe electrodo by gravity and to swing down into contact with the otherterminal when the electrode is removed, substantially as set forth.

41. In an electric arc lamp, the combination of one series terminal,current feeding brushes supported from said terminal to have radial andlongitudinal movement relative to the electrode and t0 be moved upwardand outward by the insertion of said electrode, and the other seriesterminal havinga projection engaged by the brushes when the electrode isremoved, substantially as set forth.

42. In an electric arc lamp, the combination of a series terminal havingan electrode-container, the other series terminal having a projection,and brushes supported in said electiode-container to have longitudinaland radial play relativo to said container and `to have contact with theprojection when the electrode is removed, and to be brought out of suchcontact when the electrode is inserted, substantially as set forth.

43. In an electric arc lam p, the combination of one series terminalhaving a tubular electrode container, the other series terminal formedwith a projecting portion, and brushes supported in said former terminalto have longitudinal and radial play in their relation to Saidelectrode-container and adapted to have contact with said projectionwhen the electrode is removed from its engagement with the brushes andto be brought out of such ported to have longitudinal and radial playthrough the sides of said tube, and a disk through which theelectrode-containing tube passes, said disk forming a part of the otherterminal ofthe series and being formed with an annular flange adapted tohave contact with said brushes when the electrode is removed, and tohave such contact interrupted when the electrode is inserted,substantially as set forth.

45. In an electric arc lamp, the combination of one terminal of theseries, the movable armature of the electrode-feeding mechanism, saidarmature forming a part of said terminal, and a contactformingapart ofthe other terminal of the series and arranged to have contact with thearmature when the latter is at the extreme of its attracted position,substantially as set forth.

46. In an electric arc lamp, the combination of one terminal of theseries, clutches for the electrode movablysupported in said terminal andin contact with the same, a movable armature engaging said clutches whenattracted, and a contactforming a part of the other terminal of theseries and arranged to have con-V tact with the armature when the latteris at the extreme of its attracted position, substantially as set forth.

47. In an electric arc lamp, the combination of an electrode-containingtube forming one terminal of theseries, clutches supported in said tubeto have longitudinal and radial play in the'same, a contact forming apart of the other terminal of the series, and a movable armature havingin'clined surfaces engaging the clutches when attracted and forming acut-out contact with the terminal contact when at the extreme of itsattracted position, substantially as set forth 48. In an electric arclamp, the combination of a disk forming a part of one terminal of theseries, an electrode-containing tube secured in electrical contact withsaid disk through the center of the same, clutches movably supportedupon said tube to have longitudinal and radial play through the sides ofthe same and in electrical contact with the same, a movable armaturehaving inclined surfaces engaging and having contact with said brusheswhen attracted, and contacts inserted through but insulated from thedisk, forming parts of the other terminal of the series, and havingelectrical cut-out contact with the armature when the latter is at theextreme of its attracted position, substantially as set forth. Y

49. Two or more magnets arranged with all of their poles in a completemagnetic series and with gaps between all of their opposite IOO .IOS

poles, in combination with an armature movable within such gaps tocomplete the magnetic circuit, substantially as set forth.

50. Two or more electro-magnets arranged with all of their poles in acomplete magnetic series and with gaps between all of their oppositepoles, in combination with an armature movable within such gaps tocomplete the magnetic circuit, substantially as set forth.

5l. In an electric arc lamp, the combination of an electrdmagnet of thehorseshoe type formed with axial bores in its limbs, anotherelectromagnet of the horseshoe type arranged with both of its poles at adistance from the poles of said first magnet and in magnetic series withthe latter, and formed with bores registering with the bores in thelimbs of the first magnet, and a movable armature having cores slidingwithin the bores of said magnets and in the joint fields of the same,substantially as set forth.

52. In an electric are lamp, the combination of an electro-magnet of thehorseshoe type having axial bores in its limbs, another electro-magnetof the horseshoe type arranged with both of its poles at a distance fromthe poles of the first magnet and in magnetic series with the latter,and formed with axial bores in its limbs, brass tubes secured withinsaid bores to space apart the poles of the magnet, and a movablearmature havingits cores sliding within said tubes and in the jointfields of said magnets, substantially as set forth.

53. In an electric arc lamp, the combination of an electro-magnet of thehorseshoe type formed with axial bores in its limbs, anotherelectro-magnet arranged with both of its poles at a distance from thepoles of the first magnet and in magnetic series with the latter, brasstubes secured within said axial bores to space apart the poles of themagnet, and a movable armature having cores sliding within said tubes inthe joint fields of said magnets, substantially as set forth.

54. In an electric arc lamp, an electro-magnet having axial bores in itslimbs, another electro-magnet having registering bores and arranged withits poles at a distance from the poles of said magnet and in magneticseries with the same, and lining tubes within the bores and thearmature,-said magnets and tubes forming a portion of a series terminal,in combination with a movable armature having its cores sliding withinthe lining tubes and in the fields of said magnets and forming a movablepart of a series cut-out, and metallic pellets within the lining tubesand in electrical contact with the armature cores and said tubes,substantially as set forth.

55. In an electric arc lamp, the combination of an airtight casing, anelectro-magnet having a disk forming the top of said casing and havingbores through said disk and through its limbs, an electro-magnet havingaxial bores through its limbs registering with the bores of said firstelectro-magnet, metal tubes fitted in said bores and having their upperends closed air tight, and an armature in the casing having its coressliding in said tubes, substantially as set forth.

5G. In an electric arc lamp, the combination of an arc-inclosing chamberclosed air-tight at its sides and top, a tube fitted in the top of saidchamber and closed air-tight at its upper end, said tube serving as anelectrodecontaining tube, clutch mechanism and current-feeding mechanismfor the electrode engaging the same through slots in said tube, and anairtightehamberinclosing the slotted portion of the tube, substantiallyas set forth.

57. In an electric arc lamp, the combination of a centralelectrode-containing tube, an arcinclosing chamber supported from thelower portion of said tube, an electromagnet upon the tube above saidchamber, and electrode and current feeding mechanism supported by saidtube, between the electro-magnet and the arc-inclosing chamber,substantially as set forth.

5S. In an electric arc lamp, a carbon-holding tube formed with acontracted socket portion having longitudinal slits closed at both ends,substantially as set forth.

59. In an electric arc lamp, a carbon-holding tube formed with acontracted and longitudinally slitted socket portion and with aninternal bead stop above said socket portion, substantially as setforth.

60. In an electric arclamp, the combination of a centralcarbon-containing tube, an elec tro-magnet supported upon said tube, anegative terminal disk supported upon the tube, and a nut upon the lowerend of said tube securing said disk upon the tube, substantially as setforth.

6l. In an electric arclam p, the combination of a centralcarbon-containing tube, an electro-magnet secured upon said tube andhaving a disk, a negative terminal disk upon the tube, a casing betweenthe magnet disk and terminal disk, and a nut upon the lower end of thetube securing the disk and clamping it against the casing, substantiallyas set forth.

6:2. In an electric arc lamp, the combination of a centralcarbon-containing tube, an electro-magnet secured upon said tube,clutches supported upon said tube, an armature sliding around said tubeand actuating said clutches, brushes supported upon said tube, anegative terminal disk supported upon said tube, a nut upon the tube andsecuring said disk, a lower carbon-supporting frame supported upon saidtube, and a globe clamped between said frame and terminal disk,substantially as set forth.

G3. In an electric arc lamp, the combination of an arc-inelosingchamber, au airtight casing communicating with said arc-inclosingchamber, an electro-magnet outside of said casing and having airtightbores communicating with said airtight casing, and an armature in saidairtight casing and having cores gaged and actuated by the armature, tohave radial play in their relation to the electrode, and to bear againstthe same by gravity Wh en disengaged from the armature, and setsofbrushes suspended to have radial play in their relation to the electrodeand to engage the same by `gravity, -said sets of clutches and brushesbeing arranged at distances above zo one another to engage and centerthe electrode at aplurality of points, substantially as set forth.

66. In an electric arc lamp, the combination of a feeding coil, anarmature for the same formi-ng a series terminal, and a contact forminganother series terminal and in the path of said armature when the latteris attracted, substantially as set forth.

In testimony that I claim the foregoing to be my invention I havehereunto set my hand this 19th day of October, A. D. 1892.

WILLIAM JANDUS.

Witnesses:

WM. SECHER, J. C. TURNER.

